People work 5 days a week because of protracted violent strikes by unions and socialist revolutionaries forcing governments to recognize labor rights. Prior to that the norm was working 7 days a week, sunup to sundown, with only Christmas off, from adolescence until you died.

SEs would rather play many player versions of the prisoner's dilemma than unionize.

You're right. We need to bring back protracted violent strikes by unions and socialists!